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else if

If you want to distinguish multiple cases, you can supplement an if with any number of else if. Finally, a single else can be added.
var message;
if (amount > 1000) {
  message = 'Too high. No payout possible!';
} else if (amount < 10) {
  message = 'Too low. No payout possible!';
} else {
  message = 'The amount will be paid out!';
}
First it is checked whether amount is greater than 1000. If so, the 'Too high ...' message is set and the code will be continued at the end of the entire block. If not, it is checked whether amount is less than 10. If so, the 'Too low ...' message is set and the code will be continued at the end of the entire block. If no condition is met, the final else block is executed.

Exercise

Write a function addWithSurcharge that adds two amounts with surcharge. For each amount less than or equal to 10, the surcharge is 1. For each amount greater than 10 and less than or equal to 20, the surcharge is 2. For each amount greater than 20, the surcharge is 3. The call addWithSurcharge(10, 30) should return 44.